Patent US2062260A successfully refreshed from Google Patents.
Patent US3702368A successfully refreshed from Google Patents.
US3702368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crucibles
Assignee: CRYSTALOX 1982 Ltd
•
Filing: 1970-12-30
•
Granted: 1972-11-07
•
Expires: 1990-12-30
Abstract
Abstract The invention provides an improved design for a crucible for the melting of materials by means of radio frequency eddy currents induced in the materials. A segmented platform is located intermediate an open end of the crucible and a closed base at the opposite end, in a region where the crucible wall is segmented, thereby to separate a melt from the ''''cold spot'''' in the crucible caused by the electrical short circuit of the closed base end. The outer surface of the wall segments is curved and defines a single cylindrical surface to facilitate fitting within a primary induction coil.
Inventors
- 👤 David Ainsworth Hukin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:13
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0001; F27D99/0006; F27B; F27B14/00; F27B14/06; F27B14/061; F27B14/063; F27B14/08; F27B14/14; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/32; F27B2014/0837
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A crucible having a generally cylindrical body including a plurality of elongated slots extending longitudinally in the body and circumferentially spaced about the longitudinal axis of the body to define a plurality of elongated wall segments of the body, the body being hollow to provide a melt chamber surrounded and defined by said wall segments, said wall segments terminating in free extremities spaced from each other at one end of the body, said slots and wall segments defined thereby terminating intermediate the ends of the body with the portion of said body between the wall segments and other end of the body constituting a base integral with said wall segments, an induction coil mounted about said body in surrounding relation to said wall segments, the cross-section of said wall segments gradually and uniformly increasing in thickness in the transverse direction of the body at a region opposite the free extremities of said wall segments to define a segmented platform extending transversely of the body intermediate the ends thereof to concentrate a radio frequency field on said region while also shaping the radio frequency field at said region, said induction coil extending from adjacent said one end of the body to said region.
Claim 2
Dependent Claim
202 words
A crucible having a generally cylindrical body including a plurality of elongated slots extending longitudinally in the body and circumferentially spaced about the longitudinal axis of the body to define a plurality of elongated wall segments of the body, the body being hollow to provide a melt chamber surrounded and defined by said wall segments, said wall segments terminating in free extremities spaced from each other at one end of the body, said slots and wall segments defined thereby terminating intermediate the ends of the body with the portion of said body between the wall segments and other end of the body constituting a base integral with said wall segments, an induction coil mounted about said body in surrounding relation to said wall segments, the cross-section of said wall segments gradually and uniformly increasing in thickness in the transverse direction of the body at a region opposite the free extremities of said wall segments to define a segmented platform extending transversely of the body intermediate the ends thereof to concentrate a radio frequency field on said region while also shaping the radio frequency field at said region, said induction coil extending from adjacent said one end of the body to said region.
Claim 3
Dependent Claim
33 words
A crucible as set forth in claim 1 in which the outer surfaces of the wall segments all lie on a single cylindrical surface to facilitate location of a primary induction coil therearound.
Claim 4
Dependent Claim
25 words
A crucible as set forth in claim 3 in which the radially innermost ends of the platform segments all lie on a coaxial cylindrical surface.
Claim 5
Dependent Claim
59 words
A crucible as set forth in claim 1 in which the base is cut away to define a first set of ports each communicating with the hollow interior of a wall segment and a second set of ports each communicating with one end of a tube fitted within each hollow wall segment and communicating with the remote end Thereof.
Claim 6
Dependent Claim
36 words
A crucible as set forth in claim 1 in which the base is cut away to form a central threaded opening by which it can be screwed onto a supporting spigot having a complementary thread profile.
Claim 7
Dependent Claim
29 words
A crucible as set forth in claim 5 in combination with a supporting platform having an upstanding externally threaded spigot for engagement in the threaded opening in the base.
Claim 8
Dependent Claim
27 words
A crucible and platform combination as set forth in claim 6 wherein the platform cooperates with the underside of the base to form a cooling water reservoir.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |